Yes, in the winter it will help in allowing the coolant and engine to warm up faster and hold the heat better. On very cold wet days the fan being constantly on could actually cause ice to form on the radiator and block up the air flow.

 

Your alternator requires 1 engine horsepower to produce 25 amps. The fan on high can consume what 30 amps?

Electricity is not free, I have a digital ammeter and 3 batteries. I can feel, hear the difference in engine tone when 65 amps are flowing into the 3 depleted batteries, versus when they are full and take only 3 amps.

 

Thanks both of you for your input. I guess I'll go ahead and wire it up using a controller

 

So now I'm trying to think of how I want this set up. My thought is that I want to set it up to have the low speed kick on at a certain temp, and then the high speed would kick on when I have the AC on. However, I'm not sure if it's needed but I'd also like to have the high speed kick on if for whatever reason I reached another higher temp. But, don't seem to be able to do that with the controller that I have. Does that mean I'll need to get two controllers if that's the setup I want?

 

The sensor I used fits into the coolant jacket of the engine. Mine is a 185 degree on and 170 degree off unit. When the sensor trips it completes the ground side of the circuit to the relay triggering the relay to send power to the electric fan.

The kit pictured below does not have provisions for an A/C circuit, but you can get one that does so the fan runs when your compressor runs.





I have found that the kits with provisions for A/C generally complete the positive side of the circuit, and are the radiator probe types. The probe kit is probably the one you want. See below:

 

I already have the probe type kit. I'm just wondering if it's at all possible to use one controller like this one to activate the fan on both low and high speed depending on the situation. I may be over thinking this because from what I'm reading everyone seems to be using only the low speed with great success.

 

Can't help with that -- the generic fan has only one speed; full blast!

I imagine you could use two probe kits with different heat ranges to activate the low speed and high speed separately.

That would be very cool but probably qualify as over-engineering for this application.

 

Considering the t-stat doesn't open until 195 degrees, 170-185 seems low to me. I would've expected it to be up around 195, give or take.

 

I have it running off a Tee from the intake manifold, so it takes a bit more heat to activate it. Works perfectly.

 

I'm not too sure I'm confident in the probe type, so I have both at the moment and will return the one I don't need. Only problem is that with the screw-in type I haven't found a place where I can screw it in